Conveying apparatus having a modular conveying belt and at least one toothed drive wheel

ABSTRACT

The conveyor has a modular conveyor belt (1) consisting of several modules (2) each with a plate-shaped module body (21). Tw series of link-eyelet elements (22,23) protrude from two opposite sides of the module body and each comprise a link-eyelet (221,231). Two adjacent modules interlock and are joined by a bar (3) going through the eyelets. At least one drive cog wheel (4 has teeth (41,42) driving the conveyor belt. At least one drive cog wheel has two series of teeth distributed over the periphery with the teeth of the two series staggered in relation to each other.

CROSS-REFERENCE TO RELATED APPLICATION

Applicants hereby claim priority based on Swiss Patent Application No.837/99 filed May 5, 1999.

FIELD OF THE INVENTION

The present invention relates to a conveying apparatus having a modularconveying belt and at least one toothed drive wheel.

BACKGROUND OF THE INVENTION

Known modular conveying belts are made up of a plurality of modules inwhich each has a plate-like module body and a first and second series ofarticulation-eyelet elements which project from two opposite sides ofthe module body. Each of these articulation-eyelet elements comprises anarticulation eyelet, it being the case that the articulation eyelets ofeach of the two articulation-eyelet-element series are aligned in orderto receive a continuous articulation rod. Two adjacent modulesinterengage and are articulated on one another by an articulation rodwhich passes through the articulation eyelets of onearticulation-eyelet-element series of one module and the articulationeyelets of one articulation-eyelet-element series of the other module.The modules are usually offset with respect to one another, with theresult that it is possible to form a conveying belt of the desiredlength and width. The conveyable articles are transported on conveyingsurfaces of the module bodies and of the articulation-eyelet elements.

In certain applications, particularly in the foodstuffs industry, it isnecessary to have a conveying-belt structure which can easily becleaned. A modular conveying belt of this type is described, forexample, in U.S. Pat. No. 4,925,016. In order to drive the conveyingbelt, a transverse rib is arranged on the underside of the modulebodies, transversely to the conveying direction in each case.Longitudinal ribs have been dispensed with in order to ensure goodcleaning. The conveying belt is driven by a plurality of parallel,spaced-apart toothed drive wheels which have drive teeth which arepositioned against the transverse ribs. Provided on the toothed drivewheels in addition to said drive teeth are guide teeth which each engagein the gap between two adjacent articulation-eyelet elements ofinterengaging modules and thus guide the modular conveying beltlaterally.

This conveying apparatus known from U.S. Pat. No. 4,925,016 has thedisadvantage that the toothed drive wheels have guide teeth in additionto the drive teeth, that is to say they involve relatively high outlayin structural terms. Moreover, the additional guide teeth make cleaningmore difficult and there is a risk of conveyable articles passing ontothe conveying-belt underside being pressed by said guide teeth into thenarrow interspace between two adjacent articulation-eyelet elements,from where they were very difficult to remove again.

SUMMARY OF THE INVENTION

In view of the disadvantages of the hitherto-known, above-described,modular conveying belts and toothed drive wheels, the object of theinvention is to provide a conveying apparatus of the type mentioned inthe introduction in the case of which the toothed drive wheel or thetoothed drive wheels, which serves/serve both for driving and forguiding the modular conveying belt, is/are of as straightforward aconstruction as possible. The conveying belt and the toothed drive wheelor wheels are also intended to be easy to clean.

The object is achieved by the conveying apparatus according to theinvention as is defined in independent Patent Claim 1. Preferred designvariants can be gathered from the dependent patent claims. IndependentPatent Claims 9 and 10 related respectively to a toothed drive wheel andto a modular conveying belt according to the invention.

The invention relates to a conveying apparatus having a modularconveying belt which is made up of a plurality of modules, and having atleast one toothed drive wheel. The modules each have a plate-like modulebody and a first and second series of articulation-eyelet elements whichproject from two opposite sides of the module body and each comprise anarticulation eyelet. Two adjacent modules interengage and arearticulated on one another by an articulation rod which passes throughthe articulation eyelets of one articulation-eyelet-element series ofone module and the articulation eyelets of onearticulation-eyelet-element series of the other module. The at least onetoothed drive wheel has teeth for driving the conveying belt. Theessence of the invention, then, resides in the fact that the modules andthe at least one toothed drive wheel are designed and arranged suchthat, during driving of the conveying belt, the teeth each engagebetween two adjacent articulation-eyelet elements of a module, in orderto form direct lateral guides for these two articulation-eyeletelements.

By virtue of the invention, the toothed drive wheels can be produced ina more straightforward manner than in the case of the hitherto-knownconveying apparatuses having modular conveying belts which have moduleswith plate-like module bodies. Instead of separate drive and guideteeth, both the drive function and the guidance function are performedby the same teeth. Since these teeth do not engage in the gap betweentwo adjacent articulation-eyelet elements of interengaging modules, therisk of conveyable articles passing onto the conveying-belt undersidebeing pressed into the gap is reduced to a considerable extent.

Moreover, it is possible to use the same toothed drive wheels both formodular conveying belts with continuous conveying surfaces and withconveying surfaces which are provided with openings, e.g., grid-likeconveying surfaces, as well as for conveying belts which do not have anygaps between two adjacent eyelets. A single toothed-drive-wheel shape issufficient for all belt types with the same pitch. A cost-effectivesolution with straightforward storage is thus provided.

Since, alongside the articulation-eyelet elements and the transverseribs which are provided in a fair number of design variants, there areno additional elements for belt guidance, e.g., ribs or protuberances,on the underside of the modular conveying belt, the latter is also easyto clean.

BRIEF DESCRIPTION OF THE DRAWINGS

The conveying apparatus according to the invention is described in moredetail hereinbelow by way of two exemplary embodiments and withreference to the attached drawings, in which:

FIG. 1 shows a perspective view, obliquely from beneath, of two modules,connected by an articulation rod, of a first exemplary embodiment of amodular conveying belt according to the invention;

FIG. 2 shows a perspective view of a toothed drive wheel according tothe invention;

FIG. 3 shows the modular conveying belt from FIG. 1 being driven andguided by the toothed drive wheel from FIG. 2;

FIG. 4 shows an enlarged detail from FIG. 3;

FIG. 5 shows a view from beneath a part of the modular conveying beltfrom FIG. 4 with toothed-driven-wheel teeth sectioned along line A—A;and

FIG. 6 shows a second exemplary embodiment of a modular conveying beltbeing driven and guided by a toothed drive wheel.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIG. 1, that part of a modular conveying belt 1 which isillustrated is made up of two interengaging modules 2 which arearticulated on one another by means of an articulation rod 3. Eachmodule 2 has a module body 21, a first and second series ofarticulation-eyelet elements 22, 23,, which project from two oppositesides of the module body 21 and each comprise an articulation eyelet221, 231 in the form of a slot, and a transverse rib 24 arranged on theunderside of the module body 21, transversely to the conveyingdirection. A part of the articulation-eyelet elements 22, 23 extends ineach case directly on the underside of the module body 21. Thearticulation eyelets 221, 231 of each of the twoarticulation-eyelet-element series 22, 23 are aligned with one anotherand arranged more or less at an angle of 45° to the conveying surface,with the result that the articulation rod 3 can pass through thearticulation eyelets 231 of one articulation-eyelet-element series 23 ofone module 2 and the articulation eyelets 221 of onearticulation-eyelet-element series 22 of the other module 2 and is fixedby the two articulation-eyelet-element series 22, 23.

The articulation-eyelet elements 22, 23 are considerably wider in theirtop part than in their bottom part, which has the articulation eyelet221, 231 with the result that adjacent articulation-eyelet elements 22,23 of interengaging modules 2 adjoin one another in a virtually gap-freemanner in the top region. Moreover, the top side of the modules 2 is offlat design, which results in a planar, essentially virtually fullycontinuous conveying surface.

The transverse ribs 24 extend downwards from the underside of the modulebodies 21, in the center of the latter, and have a symmetrical, in thiscase trapezoidal cross section, with the result that the modularconveying belt 1 can be moved just as easily forwards as backwards,perpendicularly to the transverse ribs 24.

The following applies to the rest of this description. If, in order toclarify the drawings, a figure contains designations which are notexplained in the directly associated text of the description, then youare referred to the point at which they have been mentioned in previousdescriptions of the figures.

Referring to FIG. 2, the toothed drive wheel 4 illustrated comprises anoctagonal wheel body 44 which is provided with four oval holes 45 and inthe center of which there is arranged a hub 46 with an essentiallysquare opening 47 which is fastened on a square shaft. The wheel body 44is of considerably wider design in the outer region 442 than in theinner region 441 and, on its outer circumference, forms eight planarsurfaces 43 on which two teeth 41, 42 are arranged in each case. The twoteeth 41, 42 arranged on the surface 43 are each of the same shape, buthave been rotated through 180° with respect to one another. Those endsof the two teeth 41, 42 which are directed away from one another in thedirection of rotation of the toothed drive wheel 4 each extend as far asthe border of the planar surface 43.

The teeth 41, 42 are distributed in two series over the circumference ofthe toothed drive wheel 4 such that, during driving of the modularconveying belt 1, the transverse ribs 24 of the latter each end upbetween one tooth 41 of one series and one tooth 42 of the other series,and driving in both directions of rotation of the toothed drive wheel 4is possible. The teeth 41 of one series and the teeth 42 of the otherseries are offset laterally with respect to one another.

Turning to FIGS. 3-5, in order to drive the modular conveying belt 1,which comprises a multiplicity of modules 2 articulated on one anotherby means of articulation rods 3, use is usually made of a plurality oftoothed drive wheels 4 spaced apart from one another on a shaft, onlyone toothed drive wheel being visible here. It can clearly be seen thatthe transverse ribs 24 of the driven modules 2 are each located betweenone tooth 41 of one series and one tooth 42 of the other series, and,depending on the direction of rotation, the tooth 41 or the tooth 42pushes the corresponding transverse rib 24 forwards.

Those ends of the teeth 41, 42 which are directed away front thetransverse ribs 24 each extend between two adjacent articulation-eyeletelements 22, 23 of a module 2, with the result that, during driving ofthe conveying belt 1, the teeth 41, 42 each engage between two adjacentarticulation-eyelet elements 22, 23 of one module 2 and, at the sametime, between the transverse rib 24 of said module 2 and thearticulation-eyelet element 23, 22, likewise engaging between said twoadjacent articulation-eyelet elements 22, 23, of the articulated module2. The side surfaces of the teeth 41,42 serve as guide surfaces for theside surfaces of the articulation-eyelet elements 22, 23 since themodules 2 can only be displaced laterally to the extent where the sidesurfaces of the articulation-eyelet elements 22, 23 butt against theside surfaces of the teeth 41, 42.

In FIG. 6, the modular conveying belt 101 according to the secondexemplary embodiment illustrated is made up of interengaging modules 102which are articulated on one another by means of articulation rods 103.Each module 102 has a module body 121 and a first and second series ofarticulation-eyelet elements 122, 123 which project from two oppositesides of the module body 121 and each comprise an articulation eyelet126, 127 in the form of a slot. A part of the articulation-eyeletelements 122, 123 extends in each case directly on the underside of themodule body 121. The articulation eyelets, 126, 127 of each of the twoarticulation-eyelet-element series 122, 123 are aligned with one anotherand arranged more or less at an angle of 45° to the conveying surface,with the result that the articulation rod 103 can pass through thearticulation eyelets 126 of one articulation-eyelet-element series 122,123. In contrast to the modular conveying belt 1, the modular conveyingbelt 101 does not have any transverse rib on the underside of the modulebody 121. The ease of cleaning is thus further improved.

Apart from the shape of the teeth 141, 142, the toothed drive wheel 104is of the same construction as the toothed drive wheel 4. Since theconveying belt 101 is driven in this case by the teeth 141, 142 beingpositioned against the articulation-eyelet elements 122, 123, the amountof play between the teeth 141, 142 and the articulation-eyelet elements122, 123 must not be as high as in the case of the first exemplaryembodiment. The teeth 141, 142 are thus of longer design at the endswhich are directed away from one another, with the result that, duringdriving, they each butt against the articulation-eyelet element 122, 123located in front of them in the conveying direction. In the case of theexample illustrated, the teeth 142 push the articulation-eyelet elements123, and thus the conveying belt 101, to the left.

Further design variations can be realized in relation to theabove-described conveying apparatus. The following should be expresslymentioned here:

It is also conceivable to use a toothed drive wheel 4; 104 with a roundouter circumference.

The teeth 41, 42 and the transverse ribs 24 may be of specific shapeswhich allow better mutual rolling characteristics. The same applies tothe teeth 141, 142 and the articulation-eyelet elements 122, 123.

Instead of, in the second exemplary embodiment, the teeth 141, 142 ofthe toothed drive wheel 104 being of longer configuration than in thefirst exemplary embodiment, it would also be possible for thearticulation-eyelet elements 122, 123 of the modular conveying belt 101to be of longer design.

What is claimed is:
 1. A conveying apparatus having a modular conveyingbelt (1, 101) which is made up of a plurality of modules (2, 102) and afirst and second series of articulation-eyelet elements (22, 23, 122,123) which project from two opposite sides of a module body (21, 121)and each comprise an articulation eyelet (221, 231, 126, 127), in whichtwo adjacent modules (2, 102) interengage and are articulated on oneanother by an articulation rod (3, 103) which passes through thearticulation eyelets (221, 231, 126, 127) of onearticulation-eyelet-element series of the adjacent modules (2, 102), andhaving at least one toothed drive wheel (4, 104) with teeth (41, 42,141, 142) for driving the conveying belt (1, 101), characterized in thatthe modules (2, 102) and the at least one toothed drive wheel (4, 104)are designed and arranged such that, during driving of the conveyingbelt (1, 101), the teeth (41, 42, 141, 142) each engage against anarticulation-eyelet-element of a first module and are positioned betweentwo adjacent articulation-eyelet elements (22, 23, 122, 123) of a secondmodule (2, 102) forming direct lateral guides for the modular conveyingbelt.
 2. Conveying apparatus according to claim 1, characterized in thaton each module one transverse rib (24) is arranged on the underside ofthe module bodies (21), transversely to the conveying direction, and,during driving of the conveying belt (1), the teeth (41, 42) of thetoothed drive wheel (4) engage against said transverse ribs (24). 3.Conveying apparatus according to claim 2, characterized in that thearticulation-eyelet elements (22, 23, 122, 123) each have a partextending directly on the underside of the module body (21, 121). 4.Conveying apparatus according to claim 3, characterized in that theunderside of the module bodies (21, 121) is smooth apart from thetransverse rib (24) and the parts of the articulation-eyelet elements(22, 23, 122, 123) which extend directly on the underside of the modulebody (21, 121).
 5. Conveying apparatus according to claim 2,characterized in that the at least one toothed drive wheel (4, 104) hastwo series of teeth (41, 42, 141, 142) distributed over thecircumference, the teeth (41, 141) of one series and the teeth (42, 142)of the other series being offset with respect to one another laterallyand in the circumferential direction, with the result that, duringdriving of the conveying belt (1, 101), the transverse ribs (24) eachend up between one tooth (41, 141) of one series and one tooth (42, 142)of the other series.
 6. Conveying apparatus according to claim 5,characterized in that one tooth (41, 141) of one series and one tooth(42, 142) of the other series are arranged on a planar surface (43) ofits drive wheel, in which the ends of the two teeth (41, 42, 141, 142)which are directed away from one another in the conveying directionextend as far as a border of the surface (43), and the two teeth (41,42, 141, 142) arranged on a surface (43) are preferably of the sameshape but have been rotated through 180° in a horizontal plane withrespect to one another.
 7. The conveyor apparatus of claim 5 whereineach tooth of one series of teeth has a curved surface which engagesagainst a matching curved surface of the articulation-eyelet element ofthe first module and wherein each tooth of the other series of teethfurther has a planar drive surface which engages against matching planardrive surface of the transverse rib of the second module.
 8. Theconveyor apparatus of claim 5 wherein each tooth in the two series ofteeth have a curved surface which engages against a matching curvedsurface of the articulation-eyelet element of the first module and athird module and further having a planar drive surface which engagesagainst a matching planar drive surface of the transverse rib of thesecond module with the teeth of one series having the curved toothsurface facing in a forward direction and the planar drive surfacefacing in a rearward direction and wherein the teeth of the other serieshave the curved tooth surface facing in a rearward direction and theplanar drive surface facing in a forward direction so that the modularconveyor belt is capable of being driven in both a forward and arearward direction.
 9. The conveyor apparatus of claim 2 wherein thetransverse rib has a trapezoidal cross-section.
 10. The conveyorapparatus of claim 2 wherein at least a portion of the transverse ribengaged by the teeth is planar.
 11. The conveyor apparatus of claim 2wherein at least a portion of the teeth which engages against thetransverse rib is planar.
 12. The conveyor apparatus of claim 2 whereinat least a portion of the transverse rib engaged by the teeth is planarto match a similarly planar drive surface of the teeth.
 13. The conveyorapparatus of claim 12 wherein the matching planar surface of thetransverse rib and the planar drive surface of the teeth are inclinedwith respect to an upper surface of the module.
 14. Conveying apparatusaccording to claim 1, characterized in that, during driving of theconveying belt (101), the teeth (141, 142) of the toothed drive wheel(104) are positioned against the articulation-eyelet elements (122,123).
 15. A conveying apparatus according to claim 1, characterized inthat the toothed drive wheel has at least two laterally andcircumferentially offset series of teeth (41, 42, 141, 142) distributedover the circumference.
 16. The conveying apparatus of claim 1 whereinat least a portion of the articulation-eyelet elements engaged by theteeth is curved.
 17. The conveyor apparatus of claim 1 wherein at leastthat a portion of the teeth which engages against articulation-eyeletelements is curved.
 18. The conveyor apparatus of claim 1 wherein atleast a portion of the articulation-eyelet elements engaged by the teethis curved to match a similarly curved drive surface of the teeth. 19.Conveying apparatus having a modular conveying belt (1, 101) which ismade up of a plurality of modules (2, 102) and a first and second seriesof articulation-eyelet elements (22, 23, 122, 123) which project fromtwo opposite sides of a module body (21, 121) and each comprise anarticulation eyelet (221, 231, 126, 127), in which two adjacent modules(2, 102) interengage and are articulated on one another by anarticulation rod (3, 103) which passes through the articulation eyelets(221, 231, 126, 127) of one articulation-eyelet-element series of theadjacent modules (2, 102), wherein each module has a transverse ribprovided on the underside of the module body, transversely to theconveying direction, and having a toothed drive wheel (4, 104) withteeth (41, 42, 141, 142) for driving the conveying belt (1, 101), thedrive wheel having two series of teeth (41, 42, 141, 142) distributedover the circumference, the teeth (41, 141) of one series and the teeth(42, 142) of the other series being offset with respect to one anotherlaterally and in the circumferential direction, and wherein each toothin two series of teeth have a curved surface which engages against amatching curved surface of the articulation-eyelet element of the firstmodule and a third module and further having a planar drive surfacewhich engages against a matching planar drive surface of the transverserib of a second module with the teeth of one series having the curvedtooth surface facing in a forward direction and the planar drive surfacefacing in a rearward direction and wherein the teeth of the other serieshaving the curved tooth surface facing in a rearward direction and theplanar drive surface facing in a forward direction so that the modularconveyor belt is capable of being driven in both a forward and arearward direction.